Can impact excitation explain efficient carrier multiplication in carbon nanotube photodiodes?
arXiv:1005.2671 · doi:10.1021/nl100639h
Abstract
We address recent experiments (Science 325, 1367 (2009)) reporting on highly efficient multiplication of electron-hole pairs in carbon nanotube photodiodes at photon energies near the carrier multiplication threshold (twice the quasi-particle band gap). This result is surprising in light of recent experimental and theoretical work on multiexciton generation in other confined materials, such as semiconducting nanocrystals. We propose a detailed mechanism based on carrier dynamics and impact excitation resulting in highly efficient multiplication of electron-hole pairs. We discuss the important time and energy scales of the problem and provide analysis of the role of temperature and the length of the diode.
References in corpus (5)
- Electron Transport and Hot Phonons in Carbon Nanotubes
- Carrier multiplication yields in PbS and PbSe nanocrystals measured by transient photoluminescence
- Carrier multiplication yields in CdSe and CdTe nanocrystals by transient photoluminescence
- Phonon and Electronic Non-radiative Decay of Excitons in Carbon Nanotubes
- Impact Excitation by Hot Carriers in Carbon Nanotubes
Cited by in corpus (12)
- Microscopic theory of singlet exciton fission. II. Application to pentacene dimers and the role of superexchange
- Carrier Multiplication in Graphene
- Uncooled Carbon Nanotube Photodetectors
- Impact of Auger processes on carrier dynamics in graphene
- Edge stability, reconstruction, zero-energy states and magnetism in triangular graphene quantum dots with zigzag edges
- Carrier multiplication in graphene under Landau quantization
- Ultrafast photocurrent measurement of the escape time of electrons and holes from carbon nanotube PN junction photodiodes
- Review on carrier multiplication in graphene
- Biexciton generation rates in CdSe nanorods are length independent
- Ultrafast Dynamics of Carrier Multiplication in Quantum Dots
- Impact ionization dynamics in small band-gap 2D materials from a coherent phonon mechanism
- Exciton Dynamics in Carbon Nanotubes: From the Luttinger Liquid to Harmonic Oscillators